Service manual

Check SiUS12-928_B
199 Service Diagnosis
7.12 Outdoor Fan System Check
Check No.19
7.13 Main Circuit Short Check
Check No.20
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
 Measure the resistance between the pins of the DB1 referring to the table below.
 If the resistance is  or less than 1 k, short circuit occurs on the main circuit.
(R15128)
YES
YES
NO
NO
Check the outdoor unit fan system.
Outdoor unit fan running?
Outdoor unit fan system
functioning.
Go to Check No. 16.
Reconnect the connector.
Fan motor lead wire
connector disconnected?
(–) terminal of the tester
(in case of digital,
(+) terminal)
(~) (+) (~) (–)
(+) terminal of the tester
(in case of digital,
(–) terminal)
(+) (~) (–) (~)
Resistance is OK.
several k
~several M

several k
~several M
Resistance is NG. 0 or  0 0 0 or 
TB2
>PS<
TB3
P2 N1
S90 S92 S93
S80
S20 S21 S22
S40
(R11690)
DB1
+
–
~
~